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History of the Periodic Table
In the 1800s scientists had not yet discovered
protons and electrons, due to this they could
only organise the elements on their Atomic
Masses. There were also two other ways to
categorise the elements :
1. Their physical and chemical properties.
2. Their relative atomic mass.
Atomic structures and protons and electrons
weren't discovered until the 20th century.…read more

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Newland's Law of Octaves
Newland had the first go at
organising the elements in 1864,
he noted that every eighth
element (hence the octaves)
had similar properties. From
this he listed the elements in
rows of seven. However, the
pattern he had discovered died
in just row three, where the
transition metals killed the
pattern.…read more

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Three Reasons why his work was
1. The groups that he had created did not have
similar properties, therefore thought that
they shouldn't be grouped together.
2. His groups had a mix of both metals and non
metals, for example; Oxygen and Iron.
3. He left no gaps for elements that had not yet
been discovered, so when they were added
the pattern would be wrong anyway.…read more

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Dmitri Mendeleev
In 1869, Dmitri arranged the elements into a
new table and he left gaps for elements still to
be discovered.
He put them in order by their atomic mass, and
leaving gaps by predicting what properties other
elements will have. And keeping them in vertical
columns.…read more

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The Modern Periodic Table
Surprisingly, when the periodic was first released,
many scientists didn't even take it seriously as they
thought it was just a bit of fun. This was because
there wasn't much evidence to support every idea,
but when newly found elements fitted nicely into
Mendeleev's table, this was thought to be enough
evidence to support his theory. From then scientists
thought the periodic was a good tool for predicting
other elements. In the 20th century, when protons
and electrons were discovered, amazingly all the
elements matched the table .…read more

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